Wireless power receiving device
To provide a wireless power receiving device and an electronic device having the wireless power receiving device whose production costs do not increase even when frequency of electromagnetic waves received for power supply varies. Further, to provide a wireless power receiving device capable of power transmission without disconnection or poor connection when a load supplied with electricity and a battery connected to an antenna are manufactured in different steps. A power transmitter and receiver portion having first and second antenna circuits and a battery portion and a load portion having a third antenna circuit are provided to charge a battery of the battery portion with a first radio signal received at the first antenna circuit and transmit electricity stored in the battery portion as a second radio signal from the second antenna circuit to the third antenna circuit so that the third antenna circuit supplies electricity to the load.
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1. Field of the Invention
The present invention relates to a wireless power receiving device into which electricity is supplied wirelessly.
2. Description of the Related Art
Since a variety of electronic devices became widespread, many kinds of products have been shipped to market. In recent years, particularly, portable electronic devices for outdoor use have been remarkably widespread.
As an example of a portable electronic device for outdoor use, an RFID (radio frequency identification) tag (hereinafter referred to as an RF tag) has been actively researched and developed for practical use. The RF tag may be classified into two types: an active RF tag and a passive RF tag. On the other hand, other than the active RF tag and the passive RF tag, another type of an RF tag including a battery which is charged by using electromagnetic waves of a cell phone or the like in order to acquire electricity to drive the RF tag, has been developed. (Reference 1: Japanese Published Patent Application No. 2003-6592)
Note that an RF tag is also referred to as an IC (integrated circuit) tag, an IC chip, an RF chip, a wireless tag, and an electronic tag.
Note that charging a battery by using radio signals of electromagnetic waves is not only for an RF tag. Research and development on an electric energy feeder dedicated to charge a battery of a portable electronic device have also been actively conducted. (Reference 2: Japanese Published Patent Application No. 2003-299255)
SUMMARY OF THE INVENTIONHowever, the shape of an antenna which receives electromagnetic waves supplied to charge a battery of a portable electronic device should be determined based on every frequency of the electromagnetic waves received. Therefore, the shape of the antenna needs to be changed every time the frequency of the electromagnetic waves varies. Since replacement of antennas in a manufacturing step increases production costs, low-cost production has been an object to be achieved.
Moreover, in the case where the battery of the portable electronic device which accumulates electricity acquired upon reception of electromagnetic waves at the antenna is larger than a load to be supplied with electricity, it is hard to form the battery and the load supplied with electricity in the same manufacturing step. However, in the case where the load supplied with electricity and the battery connected to the antenna are formed in the different steps and are connected with a penetration electrode, a wire bonding, or the like to perform power transmission between them, defects such as disconnection, poor connection, and the like may occur.
An object of the present invention is to provide a wireless power receiving device without increase in production costs even when the frequency of electromagnetic waves which are received for power supply varies. Further, it is also another object of the present invention to provide a wireless power receiving device in which power transmission between a load and a battery connected to an antenna may be conducted without disconnections, poor connections, and the like after each of two is formed in a different step.
In order to solve the above problems, a wireless power receiving device of the invention includes a power transmitter and receiver portion with a first antenna circuit, a second antenna circuit, and a battery potion, and a load portion with a third antenna circuit. In the wireless power receiving device of the invention, a battery of the battery portion is charged by using a first radio (wireless) signal received at the first antenna circuit. Electricity stored in the battery portion is transmitted as a second radio (wireless) signal from the second antenna circuit to the third antenna circuit. The third antenna circuit receives the second radio (wireless) signal so that the load is supplied with electricity.
A wireless power receiving device of the invention according to one aspect of the invention includes the following: a power transmitter and receiver portion having a first antenna circuit configured to receive a first radio (wireless) signal, a battery portion configured to store electricity upon reception of the first radio (wireless) signal at the first antenna circuit, and a second antenna circuit configured to transmit electricity stored in the battery portion as a second radio (wireless) signal; and a load portion having a third antenna circuit configured to receive the second radio (wireless) signal and a load to be supplied with the second radio (wireless) signal received at the third antenna circuit.
A wireless power receiving device according to another aspect of the invention includes the following: a power transmitter and receiver portion having a first antenna circuit configured to receive a communication signal, a battery portion configured to be charged with electricity generated upon reception of the communication signal at the first antenna circuit, a signal transmitter and receiver portion configured to amplify an amplitude of the communication signal by using the electricity of the battery portion, and a second antenna circuit configured to transmit the communication signal amplified in the signal transmitter and receiver portion as a radio (wireless) signal; and a load portion having a third antenna circuit configured to receive the radio (wireless) signal, a rectifier circuit configured to be supplied with the radio (wireless) signal received at the third antenna circuit, a power supply circuit configured to generate electricity by using an output signal from the rectifier circuit, and a signal processing circuit configured to be supplied with the radio (wireless) signal received at the third antenna circuit and electricity from the power supply circuit.
The battery portion of the invention may include a rectifier circuit, a charging control circuit, a battery, and a discharging control circuit. The charging control circuit is configured to control the charging of the battery with electricity which is generated upon input of the first radio (wireless) signal to the rectifier circuit. The discharging control circuit controls discharging of electricity stored in the second antenna circuit.
Antennas of the first antenna circuit and the second antenna circuit of the invention may be different in shapes.
The battery of the invention may be a secondary battery or a capacitor.
The secondary battery of the invention may be a lithium battery, a lithium polymer battery, a lithium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, an organic radical battery, a lead-acid storage battery, an air secondary battery, a nickel zinc battery, or a silver zinc battery.
The capacitor of the invention may be an electric double layer capacitor.
The first radio (wireless) signal of the invention may be a commercial radio wave in exterior space.
The first radio (wireless) signal of the invention may be an electromagnetic wave transmitted from a feeder.
The second antenna circuit of the invention may be configured to transmit the second radio (wireless) signal to the third antenna circuit by an electromagnetic coupling method or an electromagnetic induction method.
The first antenna circuit of the invention may include a plurality of antennas which may be different in shapes.
The second antenna circuit of the invention may include an amplifier configured to amplify an amplitude of the second radio (wireless) signal by using electricity supplied from the battery portion.
The second antenna circuit of the invention may include an oscillator configured to control a frequency of the second radio (wireless) signal.
The load of the invention may be an RF tag including a rectifier circuit, a power supply circuit, a signal processing circuit, and a fourth antenna circuit. A signal received at the fourth antenna circuit is processed in the signal processing circuit. For driving the signal processing circuit, electricity may be generated from the second radio (wireless) signal input from the third antenna circuit to the power supply circuit through the rectifier circuit.
The load portion of the invention may include a load connected to the third antenna circuit and the load may be an electronic device configured to be driven with intermittent power supply.
By using the structure of the wireless power receiving device of the invention, the power transmitter and receiver portion and the load portion may be easily removed. Accordingly, every time the frequency of the electromagnetic waves received at the first antenna circuit changes, the shape of the antenna may be adjusted by merely changing the power transmitter and receiver portion having the first antenna circuit. Therefore, the wireless power receiving device of the invention may be produced at low cost by reducing production cost for replacing the first antenna.
Moreover, in the present invention, the battery portion including the battery which accumulates electricity supplied through the electromagnetic waves and the antenna which receives the electromagnetic waves, and the load portion including the load supplied with electricity are formed separately so that the load portion is supplied with electricity through the radio (wireless) signal. Therefore, electricity may be transmitted from the battery portion which accumulates electricity supplied through the electromagnetic waves, to the load portion supplied with electricity without using a penetration electrode or a wire bonding or the like. Accordingly, defects such as disconnection or poor connection may be reduced.
Hereinafter, embodiment modes of the present invention will be described with reference to the accompanying drawings. However, the invention may be implemented by various different ways and it will be easily understood by those skilled in the art that various changes and modifications are possible. Therefore, the present invention should not be interpreted as being limited to the description of the embodiment modes. Note that identical portions or portions having the same function in all drawings illustrating the structure of the invention that are described below are denoted by the same reference numerals.
Embodiment Mode 1This embodiment mode will describe an example of a wireless power receiving device of the present invention with reference to drawings.
A wireless power receiving device 100 shown in this embodiment mode includes a power transmitter and receiver portion 101 and a load portion 102. The power transmitter and receiver portion 101 includes a first antenna circuit 103, a battery portion 104, and a second antenna circuit 105. The battery portion 104 includes a rectifier circuit 106, a charging control circuit 107, a battery 108, and a discharging control circuit 109. In addition, the load portion 102 includes a third antenna circuit 110 and a load 111.
Note that in the wireless power receiving device 100 shown in
Note that in this specification, the electromagnetic waves received at the first antenna circuit 103 from the electromagnetic wave feeder are hereinafter referred to as first radio (wireless) signals. In the case where the electromagnetic waves from the feeder are used as the first radio (wireless) signals, electricity may be transmitted wirelessly using the electromagnetic waves with a specific wavelength so that electricity is transmitted efficiently. On the other hand, in the case where commercial radio waves in exterior space are used as the first radio (wireless) signals, the wireless power supply may be performed even outside as long as the antenna is within the range of the commercial radio waves.
In the case where a feeder is used as the electromagnetic wave feeder 201 shown in
Moreover,
Further, in the case where a feeder is used as an electromagnetic wave feeder, the frequency of the first radio (wireless) signal 305 which is transmitted from the feeder to the first antenna circuit 103 in the wireless power receiving device 100 is not limited to a specific value. For example, any of the following may be employed: a sub millimeter wave of greater than or equal to 300 GHz and less than or equal to 3 THz; an extra high frequency of greater than or equal to 30 GHz and less than or equal to 300 GHz; a super high frequency of greater than or equal to 3 GHz and less than or equal to 30 GHz; an ultra high frequency of greater than or equal to 300 MHz and less than or equal to 3 GHz; a very high frequency of greater than or equal to 30 MHz and less than or equal to 300 MHz; a high frequency of greater than or equal to 3 MHz and less than or equal to 30 MHz; a medium frequency of greater than or equal to 300 kHz and less than or equal to 3 MHz; a low frequency of greater than or equal to 30 kHz and less than or equal to 300 kHz; and a very low frequency of greater than or equal to 3 kHz and less than or equal to 30 kHz.
Note that antennas which differ from each other in shapes may be combined together so that an antenna which can receive the first radio (wireless) signals having a plurality of frequency bands is employed as the first antenna circuit 103 in the wireless power receiving device 100 of the invention.
Furthermore, the rectifier circuit 106 in the power transmitter and receiver portion 101 shown in
The charging control circuit 107 in the power transmitter and receiver portion 101 may be any circuit as long as it controls the voltage level of electric signals input from the rectifier circuit 106 and outputs the voltage level to the battery 108. For example, the charging control circuit 107 may be formed with a regulator 401 and a diode 403 having a rectifying property as shown in
The electric signals whose voltage level is controlled by the charging control circuit 107 in the power transmitter and receiver portion 101 shown in
Note that a battery in the invention corresponds to a power storage means whose continuous operating time may be restored by charging. As a power storage means, a secondary battery, a capacitor, and the like are given but these power storage means are collectively referred to as a battery in this specification. As a battery, a sheet-shaped secondary battery is preferably used, and for example, reduction in size may be achieved by using a lithium battery, preferably a lithium polymer battery utilizing a gel-like electrolyte, a lithium ion battery, a lithium secondary battery, or the like although the type of the battery may differ depending on the intended use of the device. Needless to say, any battery may be used as long as it is chargeable. For example, the following batteries that are chargeable and dischargeable may be used: a nickel metal hydride battery, a nickel cadmium battery, an organic radical battery, a lead-acid battery, an air secondary battery, a nickel-zinc battery, and a silver-zinc battery. Alternatively, a capacitor may be used.
Note that as a capacitor that may be used as the battery 108 of the invention, it is preferable to use a capacitor having electrodes whose opposed areas are large. A capacitor has a simpler structure than a battery. A capacitor may be easily formed to be thin and formed by stacking layers. In particular, it is preferable to use a double-layer electric capacitor which is formed of an electrode material having a large specific surface area such as activated carbon, fullerene, or a carbon nanotube. A double-layer electric capacitor has a function of storing electricity and will not deteriorate much even after it is charged and discharged a number of times. Further, the double-layer electric capacitor has an excellent property in that it may be charged rapidly.
Note that in this embodiment mode, electricity that is stored in the battery 108 is not limited to the first radio (wireless) signals received at the first antenna circuit 103. In addition, it is also possible to employ a structure where a power generation element is supplementarily provided in a part of the power transmitter and receiver portion 101. Using the structure including the power generation element is advantageous in that the amount of electricity supplied for storage in the battery 108 may be increased and the charging rate may be increased. Note that as the power generation element, for example, a power generation element using a solar cell, a power generation element using a piezoelectric element, or a power generation element using a micro electro mechanical system (MEMS) may be used.
The discharging control circuit 109 in
Further, the discharging control circuit 109 may have a structure in which on/off of the switch 501 is controlled depending on the voltage level of the battery 108. For example, a Schmidt trigger 503 may be added to the structure shown in
Note that the wireless power receiving device of the invention may include a charging and discharging control circuit which controls the switch 402 in the charging control circuit and the switch 501 in the discharging control circuit.
Further,
In this specification, the electromagnetic waves transmitted from the second antenna circuit 105 and received at the third antenna circuit 110 are referred to as second radio signals.
As a power transmission method using a second radio (wireless) signal 112 from the second antenna circuit 105 in the power transmitter and receiver portion 101 to the third antenna circuit 110 in the load portion 102, the electromagnetic coupling method or the electromagnetic induction method (for example, a 13.56 MHz band) is preferably used because electricity may be efficiently supplied by using electromagnetic induction caused by change in the magnetic field density. In the case where the electromagnetic coupling method or the electromagnetic induction method is employed, conductive films functioning as the second antenna circuit 105 and the third antenna circuit 110 are formed in a circle (for example, a loop antenna) or a spiral (for example, a spiral antenna). In the case of employing the micro-wave method (for example, a UHF band (860 to 960 MHz band), a 2.45 GHz band, or the like) for power transmission from the second antenna circuit in the power transmitter and receiver portion 101 to the third antenna circuit in the load portion 102 by using the second radio signal 112, the shape and the length of the conductive film serving as the antenna may be appropriately determined in consideration of the wavelength of the electromagnetic waves used for signal transmission. Therefore, transmission and reception of electromagnetic waves may be performed even with a long distance in-between. In the case where the micro-wave method is employed, the conductive film serving as the antenna may be formed, for example, in a linear shape (for example, a dipole antenna), in a flat shape (for example, a patch antenna), and the like. Further, the shape of the conductive film functioning as the antenna is not limited to a linear shape; the shape may be a curved-line shape, a meander shape, or a combination thereof, considering the wavelength of the electromagnetic waves.
In addition, the structure of the third antenna circuit 110 in the load portion 102, which receives the second radio (wireless) signals 112 from the second antenna circuit 105 is the same as the structure shown in
In the present invention, antennas of the above-described first antenna circuit 103, second antenna circuit 105, and third antenna circuit 110 may have different shapes. Therefore, the first radio signals received at the first antenna circuit 103 and the second radio signals transmitted and received between the second antenna circuit and the third antenna circuit may employ different types of power transmission methods using radio signals with different frequencies. In the wireless power receiving device of the invention, the power transmitter/receiver portion 101 and the load portion 102 are formed separately so that they may be easily removed if desired. Accordingly, every time the frequency of the electromagnetic waves received at the first antenna circuit changes, the shape of the antenna may be adjusted by merely changing the power transmitter/receiver portion having the first antenna circuit. Therefore, the wireless power receiving device of the invention may be produced at low cost by reducing production cost for replacement of the first antenna.
The invention includes the battery portion having the antenna which receives the first radio signals and the battery which accumulates electricity supplied through the first radio signals, and the load portion having the load supplied with electricity, which are formed separately so that the load portion is supplied with electricity through the second radio signals transmitted and received between the second antenna circuit and the third antenna circuit. Therefore, electricity may be transmitted from the battery portion which accumulates electricity supplied through the electromagnetic waves, to the load portion supplied with electricity without using a penetration electrode or a wire bonding or the like. Accordingly, defects such as disconnection or poor connection may be reduced.
In addition, the structure of the load 111 in the load portion 102 shown in
Operation of the wireless power receiving device shown in
First, the first antenna circuit 103 in the wireless power receiving device 100 receives the first radio signal for charging the battery from an outside electromagnetic wave feeder (Step 901). When the first circuit 103 receives the first radio signal, the switch 402 in the charging control circuit 107 is turned on and the switch 501 in the discharging control circuit 109 is turned off at the same time so that the battery 108 starts to be charged (Step 902). The switch 402 in the charging control circuit 107 and the switch 501 in the discharging control circuit 109 remain on or off respectively until the battery 108 is charged with a certain amount of electricity (NO flow of Step 903). When the battery 108 is fully charged (YES flow of Step 903), the switch 402 in the charging control circuit 107 is turned off while the switch 501 in the discharging control circuit 109 is turned on so that discharging the battery 108 to the second antenna circuit 105 starts (Step 904). Upon discharging the battery 108 to the second antenna circuit 105, the amplifier 803 in the second antenna circuit 105 operates so that the second radio signal 112 is transmitted to the third antenna circuit 110 from the second antenna circuit 105 (Step 905). In the case where electricity is stored in the battery 108, the switch 402 in the charging control circuit 107 and the switch 501 in the discharging control circuit 109 remain off or on respectively (NO flow of Step 906). When the discharge of the battery 108 is finished, in other words, the battery has run out of electricity; transmission of the second radio (wireless) signal 112 from the second antenna circuit 105 to the third antenna circuit 110 is completed (YES flow of Step 906).
Although the flow chart shown in
Next, a flow chart of discharging of the battery 108 provided in the wireless power receiving device 100 shown in
In the wireless power receiving device 100 described in this embodiment mode, the battery is charged cumulatively and discharged in pulses (Step 901 and Step 902 in
For example, as shown in
The wireless power receiving device shown in
As described above, charging the battery through reception of the electromagnetic waves for a given period of time and discharging the stored electricity in pulses enable the battery to supply a large amount of electricity to the load portion even when the electromagnetic waves for charging the battery are weak. In this case, the charging period of the battery is longer than the discharging period of the battery. In addition, the amount of electricity discharged from the battery per unit time (electricity supplied to the load portion 102) is larger than that of electricity stored in the battery per unit time. Note that
Moreover, as shown in
Note that in the case where electricity stored in the battery 108 is discharged in pulses to the second antenna circuit 105, a switch circuit may be provided between the discharging control circuit 109 and the second antenna circuit 105 so that the switch circuit is periodically turned on in order to intermittently supply electricity to the second antenna circuit 105. For example, as shown in
As described above, in the present invention, antennas in the first antenna circuit 103, the second antenna circuit 105, and the third antenna circuit 110 may be formed to have different shapes. That is, the first radio (wireless) signals received at the first antenna circuit 103 and the second radio (wireless) signals transmitted/received between the second antenna circuit 105 and the third antenna circuit 110 may employ different types of power transmission methods using radio signals with different frequencies. In addition, in the wireless power receiving device of the invention, the power transmitter and receiver portion 101 and the load portion 102 are formed separately so that they may be easily removed if desired. Accordingly, every time the frequency of the electromagnetic waves received at the first antenna circuit changes, the shape of the antenna may be adjusted by merely changing the power transmitter and receiver portion having the first antenna circuit. Therefore, the wireless power receiving device of the invention may be produced at low cost by reducing production cost for replacement of the first antenna.
Moreover, in the present invention, the battery portion including the battery which accumulates electricity supplied through the first radio signal and the antenna which receives the first radio signal, and the load portion including the load supplied with electricity are formed separately so that the load portion is supplied with electricity through the second radio signals transmitted and received between the second antenna circuit and the third antenna circuit. Therefore, electricity may be transmitted from the battery portion which accumulates electricity supplied through the first radio signal, to the load portion supplied with electricity without using a penetration electrode or a wire bonding or the like. Accordingly, defects such as disconnection or poor connection may be reduced.
Note that the structure of the wireless power receiving device in this embodiment mode may be combined with the structure of the wireless power receiving device in the other embodiment modes in this specification.
Embodiment Mode 2This embodiment mode will describe an example of the wireless power receiving device provided with an RF tag as the load of the wireless power receiving device shown in Embodiment Mode 1 with reference to drawings. Note that the structure in this embodiment mode is not limited to the RF tag and may be applied to any data transmitter and receiver device which is capable of communicating data wirelessly.
An example of the wireless power receiving device in this embodiment mode will be described with reference to
The wireless power receiving device 1300 shown in
Note that the structures of the first antenna circuit 103, the battery portion 104, the second antenna circuit 105, and the third antenna circuit 110 are the same as those described in Embodiment Mode 1. In addition, the difference of the structure from that shown in
The RF tag 1301 includes a fourth antenna circuit 1302, a signal processing circuit 1303, a rectifier circuit 1310, and a power supply circuit 1311. In addition, the signal processing circuit 1303 includes a demodulation circuit 1304, a logic circuit 1305, a memory control circuit 1306, a memory circuit 1307, a logic circuit 1308, and a modulation circuit 1309.
In the signal processing circuit 1303, a communication signal transmitted from a reader/writer and received at the fourth antenna circuit 1302 is input to the demodulation circuit 1304 included in the signal processing circuit 1303. Typically, communication signals are transmitted through a process such as ASK (amplitude shift keying) modulation or FSK (frequency shift keying) modulation of carriers of 13.56 MHz, 915 MHz, or the like.
Note that the structure of the fourth antenna circuit 1302 in this embodiment mode may be the same as that of the first antenna circuit 103 in Embodiment Mode 1.
In
Note that electricity is supplied to the signal processing circuit 1303 in
In order to process signals in the signal processing circuit 1303, a reference clock signal is required. For example, the carrier of 13.56 MHz may be used for the clock signal. Alternatively, a clock generation circuit may be provided in the RF tag 1301 to acquire power supply from the power supply circuit 1311 so that clock signals are stably supplied to the signal processing circuit 1303.
In addition, as shown in
Note that the structure of the wireless power receiving device in this embodiment mode may be combined with the structure of the wireless power receiving device in the other embodiment modes in this specification. That is, as described in Embodiment Mode 1, the antennas in the first antenna circuit 103, the second antenna circuit 105, and the third antenna circuit 110 may be formed to have different shapes. In other words, each of the first radio signal received at the first antenna circuit 103 and the second radio signal transmitted and received between the second antenna circuit and the third antenna circuit may employ different types of power transmission methods using radio signals with different frequencies. By forming the power transmitter and receiver portion 101 and the load portion 102 separately, in the wireless power receiving device of the invention, the power transmitter and receiver portion and the load portion may be easily removed if desired. Accordingly, every time the frequency of the electromagnetic waves received at the first antenna circuit changes, the shape of the antenna may be adjusted by merely changing the power transmitter and receiver portion having the first antenna circuit. Therefore, the wireless power receiving device of the invention may be produced at low cost by reducing production cost for replacement of the first antenna.
Moreover, in the wireless power receiving device of this embodiment mode, the battery portion including the battery which accumulates electricity supplied through the first radio signal and the antenna which receives the first radio signal, and the load portion including the load supplied with electricity are formed separately so that the load portion is supplied with electricity through the second radio signal transmitted and received between the second antenna circuit and the third antenna circuit. Therefore, electricity may be transmitted from the battery portion which accumulates electricity supplied through the first radio signal, to the load portion supplied with electricity without using a penetration electrode or a wire bonding or the like. Accordingly, defects such as disconnection or poor connection may be reduced.
Embodiment Mode 3In this embodiment mode, as the load in the wireless power receiving device shown in Embodiment Mode 2, one example of the wireless power receiving device including the rectifier circuit, the power supply circuit, and the signal processing circuit in the RF tag of Embodiment Mode 2 will be described with reference to drawings. In this embodiment mode, a configuration in which communication signals are transmitted to and received from the outside and electricity is supplied through the radio signals, by using a power transmitter and receiver portion will be described.
One example of the wireless power receiving device in this embodiment mode will be described with reference to
A wireless power receiving device 1600 shown in
Note that the structures of the first antenna circuit 103, the battery portion 104, the second antenna circuit 105, and the third antenna circuit 110, shown in
In the signal transmitter and receiver portion 1601, a communication signal transmitted from the reader/writer and received at the first antenna circuit 103 is input to the switch 1602 provided in the signal transmitter and receiver portion 1601. Typically, communication signals are transmitted through a process such as ASK (amplitude shift keying) modulation or FSK (frequency shift keying) modulation of carriers of 13.56 MHz, 915 MHz, or the like. Note that on and off of the switch 1602 in the signal transmitter and receiver portion may be controlled as follows: for example, the switch 1602 operates in conjunction with the switch 402 in the charging control circuit 107 included in the battery portion 104 as shown in Embodiment Mode 1 such that the switch 1602 is turned off when the switch 402 is turned on, whereas the switch 1602 is turned on when the switch 402 is turned off. That is, transmission and reception of the communication signals to and from the first antenna circuit and reception of the communication signals at the first antenna circuit for charging the battery are switched alternately. Note that the communication signals may be any signals output from a reader/writer.
In
The communication signal processed in the signal processing circuit 1303 shown in
Note that electricity is supplied to the signal processing circuit 1303 in
Note that a reference clock signal is required in order to process the signals in the signal processing circuit 1303. For example, the carrier of the radio signals may be used for the clock signal. Alternatively, a clock generation circuit may be provided in the load portion 102 to acquire electricity supplied from the power supply circuit 1311 so that clock signals are stably supplied to the signal processing circuit 1303.
In this embodiment mode, for illustrative purposes, the communication signal is described as a signal which transports data between the reader/writer and the signal processing circuit, and the radio signal is described as a signal among the above-described communication signals which are transmitted and received between the second antenna circuit and the third antenna circuit.
Moreover, other than the structure shown in
A wireless power receiving device 1700 shown in
Note that the structures of the first antenna circuit 103, the battery portion 104, the second antenna circuit 105, and the third antenna circuit 110 are the same as those described in Embodiment Mode 2. The difference of the structure from the structure shown in
In the signal transmitter and receiver portion 1701, a communication signal transmitted from a reader/writer and received at the first antenna circuit 103 is input to the switch 1702 included in the signal transmitter and receiver portion 1701. Typically, communication signals are transmitted through a process such as ASK (amplitude shift keying) modulation or FSK (frequency shift keying) modulation of carriers of 13.56 MHz, 915 MHz, or the like. Note that on and off of the switch 1702 in the signal transmitter and receiver portion may be controlled as follows: for example, the switch 1702 operates in conjunction with the switch 402 in the charging control circuit 107 included in the battery portion 104 as shown in Embodiment Mode 1 such that the switch 1702 is turned off when the switch 402 is turned on, whereas the switch 1702 is turned on when the switch 402 is turned off. That is, transmission and reception of the communication signals to and from the first antenna circuit and charging of the battery are switched alternately.
In
The communication signal processed in the signal processing circuit 1303 shown in
The structures of the frequency conversion circuits 1704 and 1706 shown in
Note that electricity is supplied to the signal processing circuit 1303 in
Note that a reference clock signal is required to process signals in the signal processing circuit 1303. For example, the carrier of the radio signals may be used for clock signals. Alternatively, a clock generation circuit may be provided in the load portion 102 to acquire power supply from the power supply circuit 1311 so that clock signals are stably supplied to the signal processing circuit 1303.
Note that the structure of the wireless power receiving device in this embodiment mode may be combined with the structure of the wireless power receiving device in the other embodiment modes in this specification. That is, as described in Embodiment Mode 1, the antennas in the first antenna circuit 103, the second antenna circuit 105, and the third antenna circuit 110 may be formed to have different shapes. In other words, each of the first radio (wireless) signal received at the first antenna circuit 103 and the second radio (wireless) signal transmitted and received between the second antenna circuit 105 and the third antenna circuit 110 may employ different types of power transmission methods using radio signals with different frequencies. By forming the power transmitter and receiver portion 101 and the load portion 102 separately, in the wireless power receiving device of the invention, the power transmitter and receiver portion and the load portion may be easily removed if desired. Accordingly, every time the frequency of the electromagnetic waves received at the first antenna circuit changes, the shape of the antenna may be adjusted by merely changing the power transmitter and receiver portion having the first antenna circuit. Therefore, the wireless power receiving device of the invention may be produced at low cost by reducing production cost for replacement of the first antenna.
Moreover, in the wireless power receiving device of this embodiment mode, the battery portion including the battery which accumulates electricity supplied through the first radio signal and the antenna which receives the first radio signal, and the load portion including the load supplied with electricity are formed separately so that the load portion is supplied with electricity through the second radio signal transmitted and received between the second antenna circuit and the third antenna circuit. Therefore, electricity may be transmitted from the battery portion which accumulates electricity supplied through the first radio signal, to the load portion supplied with electricity without using a penetration electrode or a wire bonding or the like. Accordingly, defects such as disconnection or poor connection may be reduced.
Embodiment Mode 4In this embodiment mode, examples of usage patterns of the wireless power receiving device shown in the foregoing embodiment modes will be described with reference to
As a wireless power receiving device 1400 of the invention,
Moreover, as a wireless power receiving device 1450 of the invention,
In
Further, in the case where the power transmitter and receiver portion and the load portion are different in sizes, the power transmitter portion and the load portion are preferably formed separately though
Note that the power transmitter and receiver portion may include a plurality of load portions in the present invention as shown in
For example, electronic devices having the wireless power receiving device of the invention include cell phones, digital video cameras, computers, personal digital assistants (mobile computers, cell phones, portable game machines, electronic books, and the like), image reproduction devices with a recording medium (specifically, a device including a display which is capable of reproducing a memory medium such as a digital versatile disc (DVD) and displaying images therein), and the like. Examples of such electronic devices will be described below with reference to
Note that the structure of the wireless power receiving device in this embodiment mode may be combined with the structure of the wireless power receiving device in the other embodiment modes in this specification. Therefore, as described in foregoing Embodiment Mode 1, each antenna of the first antenna circuit 103, the second antenna circuit 105, and the third antenna circuit 110 may have a different shape. In other words, each of the first radio (wireless) signal received at the first antenna circuit 103 and the second radio (wireless) signal transmitted and received between the second antenna circuit and the third antenna circuit may employ different types of power transmission methods using radio signals with different frequencies. In the wireless power receiving device of the invention, by forming the antenna and the battery as the power transmitter and receiver portion and the electronic components as the load portion separately, the power transmitter and receiver portion and the load portion may be easily removed if desired. Accordingly, every time the frequency of the electromagnetic waves received at the first antenna circuit changes, the shape of the antenna may be adjusted by merely changing the power transmitter and receiver portion having the first antenna circuit. Therefore, the wireless power receiving device of the invention may be produced at low cost by reducing production cost for replacing the first antenna.
Moreover, in the present invention, the battery portion including the battery which accumulates electricity supplied through the first radio signal and the antenna which receives the first radio signal, and the load portion including the load supplied with electricity are formed separately so that the load portion is supplied with electricity through the radio signals. Therefore, electricity may be transmitted from the battery portion which accumulates electricity supplied through the first radio signal, to the load portion supplied with electricity without using a penetration electrode or a wire bonding or the like. Accordingly, defects such as disconnection or poor connection may be reduced.
This application is based on Japanese Patent Application serial no. 2006-312680 filed in Japan Patent Office on 20 Nov. 2006, the entire contents of which are hereby incorporated by reference.
Claims
1. A wireless power receiving device comprising:
- a power transmitter and receiver portion including: a first antenna circuit configured to receive a first wireless signal wirelessly; a battery portion configured to be charged with electricity generated upon reception of the first wireless signal at the first antenna circuit, and a second antenna circuit configured to transmit electricity stored in the battery portion as a second wireless signal, and
- a load portion including: a third antenna circuit configured to receive the second wireless signal, and a load configured to be supplied with the second wireless signal received at the third antenna circuit.
2. A wireless power receiving device according to claim 1,
- wherein the battery portion includes a rectifier circuit, a charging control circuit, a battery, and a discharging control circuit,
- wherein the charging control circuit is configured to control charging of the battery with electricity generated upon input of the first wireless signal to the rectifier circuit, and
- wherein the discharging control circuit is configured to control discharging of the electricity stored in the battery into the second antenna circuit.
3. A wireless power receiving device according to claim 1, wherein antennas of the first antenna circuit and the second antenna circuit are different in shape.
4. A wireless power receiving device according to claim 1, wherein the battery portion comprises one of a secondary battery and a capacitor.
5. A wireless power receiving device according to claim 1, wherein the battery portion is one of a lithium battery, a lithium polymer battery, a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, an organic radical battery, a lead-acid battery, an air secondary battery, a nickel-zinc battery, a silver-zinc battery, and an electric double layer capacitor.
6. A wireless power receiving device according to claim 1, wherein the first wireless signal is a commercial radio wave in exterior space.
7. A wireless power receiving device according to claim 1, wherein the first wireless signal is an electromagnetic wave transmitted from a feeder.
8. A wireless power receiving device according to claim 1, wherein the second antenna circuit is configured to transmit the second wireless signal to the third antenna circuit by one of an electromagnetic coupling method and an electromagnetic induction method.
9. A wireless power receiving device according to claim 1, wherein the first antenna circuit includes a plurality of antennas, and
- wherein the plurality of the antennas are different from each other in shape.
10. A wireless power receiving device according to claim 1, wherein the second antenna circuit includes an amplifier configured to amplify an amplitude of the second wireless signal by using electricity supplied from the battery portion.
11. A wireless power receiving device according to claim 1, wherein the second antenna circuit includes an oscillator configured to control a frequency of the second wireless signal.
12. A wireless power receiving device according to claim 1, wherein the load is an RF tag including a rectifier circuit, a power supply circuit, a signal processing circuit, and a fourth antenna circuit,
- wherein a signal received at the fourth antenna circuit is processed by the signal processing circuit, and
- wherein electricity for driving the signal processing circuit is generated from the second wireless signal input from the third antenna circuit to the power supply circuit through the rectifier circuit.
13. A wireless power receiving device according to claim 1, wherein the load portion includes a load connected to the third antenna circuit, and
- wherein the load is an electronic device configured to be driven with intermittent power supply.
14. A wireless power receiving device comprising:
- a power transmitter and receiver portion including: a first antenna circuit configured to receive a communication signal wirelessly; a battery portion configured to be charged with electricity generated upon reception of the communication signal at the first antenna circuit; a signal transmitter and receiver portion configured to amplify an amplitude of the communication signal by using the electricity stored in the battery portion; and a second antenna circuit configured to transmit the communication signal amplified by the signal transmitter and receiver portion as a wireless signal, and
- a load portion including: a third antenna circuit configured to receive the wireless signal; a rectifier circuit configured to be supplied with the wireless signal received at the third antenna circuit; a power supply circuit configured to generate electricity by using an output signal from the rectifier circuit; and a signal processing circuit configured to be supplied with the wireless signal received at the third antenna circuit and the electricity from the power supply circuit.
15. A wireless power receiving device according to claim 14,
- wherein the battery portion includes a rectifier circuit, a charging control circuit, a battery, and a discharging control circuit,
- wherein the charging control circuit is configured to control charging of the battery with electricity generated upon input of the communication signal to the rectifier circuit, and
- wherein the discharging control circuit is configured to control discharging of the electricity stored in the battery.
16. A wireless power receiving device according to claim 14, wherein antennas of the first antenna circuit and the second antenna circuit are different in shape.
17. A wireless power receiving device according to claim 14, wherein the signal transmitter and receiver portion includes a switch configured to control input or output of the communication signal to or from the signal transmitter and receiver portion, and an amplifier configured to amplify an amplitude of the communication signal.
18. A wireless power receiving device according to claim 14, wherein the battery portion comprises a secondary battery or a capacitor.
19. A wireless power receiving device according to claim 14, wherein the battery portion comprises one of a lithium battery, a lithium polymer battery, a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, an organic radical battery, a lead-acid battery, an air secondary battery, a nickel-zinc battery, a silver-zinc battery, and an electric double layer capacitor.
20. A wireless power receiving device according to claim 14, wherein the communication signal is a signal transmitted from a reader/writer.
21. A wireless power receiving device according to claim 14, wherein the second antenna circuit is configured to transmit the wireless signal to the third antenna circuit by using one of an electromagnetic coupling method and an electromagnetic induction method.
22. A wireless power receiving device according to claim 14, wherein the first antenna circuit includes a plurality of antennas, and
- wherein the plurality of the antennas are different from each other in shape.
23. A wireless power receiving device comprising:
- a power transmitter and receiver portion comprising a battery portion and configured to receive a first wireless signal wirelessly for charging the battery portion with electricity of the first wireless signal; and
- a plurality of electronic devices, each of the electronic devices provided adjacent to the power transmitter and receiver portion and configured to receive a second wireless signal wirelessly from the battery portion to supply an electricity to be consumed in the each of the electronic devices.
24. A wireless power receiving device according to claim 23 wherein each of the electronic devices is selected from the group consisting of a cell phone, a computer, a digital camera, an image reproduction device provided with a recording medium, a digital video camera, and a personal digital assistant.
25. A wireless power receiving device according to claim 23, wherein the battery portion comprises one of a secondary battery and a capacitor.
26. A wireless power receiving device according to claim 23, wherein the first wireless signal is a commercial radio wave in exterior space.
27. A wireless power receiving device according to claim 23, wherein the first wireless signal is an electromagnetic wave transmitted from a feeder.
28. A wireless power receiving device according to claim 23, wherein the battery portion comprises one of a lithium battery, a lithium polymer battery, a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, an organic radical battery, a lead-acid battery, an air secondary battery, a nickel-zinc battery, a silver-zinc battery, and an electric double layer capacitor.
29. A cell phone comprising:
- a body comprising a battery portion and configured to receive a first wireless signal wirelessly for charging the battery portion with electricity of the first wireless signal;
- an audio output portion;
- an audio input portion;
- a display portion; and
- an operating switch,
- wherein at least one of the audio output portion, the audio input portion, the display portion, and the operating switch is provided adjacent to the body and configured to receive a second wireless signal wirelessly from the battery portion to supply an electricity to be consumed in the at least one of the audio output portion, the audio input portion, the display portion, and the operating switch.
30. A cell phone according to claim 29, wherein the battery portion comprises one of a secondary battery and a capacitor.
31. A cell phone according to claim 29, wherein the first wireless signal is a commercial radio wave in exterior space.
32. A cell phone according to claim 29, wherein the first wireless signal is an electromagnetic wave transmitted from a feeder.
33. A cell phone according to claim 29, wherein the battery portion comprises one of a lithium battery, a lithium polymer battery, a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, an organic radical battery, a lead-acid battery, an air secondary battery, a nickel-zinc battery, a silver-zinc battery, and an electric double layer capacitor.
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Type: Grant
Filed: Nov 13, 2007
Date of Patent: Dec 25, 2012
Patent Publication Number: 20090308933
Assignee: Semiconductor Energy Laboratory Co., Ltd. (Atsugi-shi, Kanagawa-ken)
Inventor: Takeshi Osada (Isehara)
Primary Examiner: Patrick Assouad
Assistant Examiner: Steve T Chung
Attorney: Robinson Intellectual Property Law Office, P.C.
Application Number: 11/979,994
International Classification: H02J 7/00 (20060101); H01F 17/00 (20060101); H01Q 1/24 (20060101); H04L 1/02 (20060101); H01F 37/00 (20060101);